Cool game idea! I had fun playing it on normal mode and it fit the theme well. It was kinda like a puzzle shooter game which is something you don't see much.
I think the curved walls are a detriment to the game, since they make it basically impossible to predict where the ball is going to bounce and made the game feel like it was based on luck. I had to quit on the level with all of the blue walls blocking the green button and you are in a curved hallway, because the balls would just fly off in random directions and kill me. For that reason I feel like all of the walls in the game should be straight, although that introduces corner jank, so I'm not sure if there's a perfect solution.
Overall though well made and fun game!